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Add position.XFENString() #126
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When working with 3rd party chess APIs these may require positions to be expressed in X-FEN notation rather than FEN. e.g. Notably while some of the lichess.org APIs work with either FEN or X-FEN, some of them require X-FEN. This commit adds position.XFENString() for this purpose. The key difference between X-FEN and FEN is the encoding of the en passant square. X-FEN will only specify it when an opposing pawn is in position to capture, while FEN will always specify it.
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When working with 3rd party chess APIs these may require positions to be expressed in X-FEN notation rather than FEN. e.g. Notably while some of the lichess.org APIs work with either FEN or X-FEN, some of them require X-FEN. This commit adds position.XFENString() for this purpose. The key difference between X-FEN and FEN is the encoding of the en passant square. X-FEN will only specify it when an opposing pawn is in position to capture, while FEN will always specify it.